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| Dynamic structure analysis is
offered as a supplement to the FEM static module. Existing
projects can be analyzed based on a dynamic calculation that
takes all types of elements into consideration. The results
can be combined with the reactions of the static calculations
for design or the stress results.
As it supports the evaluation of response spectra according
to DIN 4149 (1981, 1992 and 2005) ÖNORM B 4015 and SIA 161, the
program is suitable for checks of structures in earthquake-prone
areas or for the analysis of machine foundations, for instance.
The earthquake checks are complemented by the option of
defining customized response spectra and superposing and
analyzing them according to CQC or SRRS methods. |
Deformation of the superposed response
spectra
(example from
BKSi GmbH, Stuttgart
– formerly IFB Dr. Braschel AG) |
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The dynamic stress resulting from a
train crossing can be easily analyzed with predefined trains
like, for instance, ICE, Thalys etc. or user-defined train
loads. All the user needs to do is define the track in the
system and select the desired train(s).
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All results can be animated graphically or
plotted against time elapsed. |
Eigenmode of
a machine foundation with point masses |
Graphical
representation of a time-dependent node displacement
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Features of the 'FEM Dynamik' Module |
- calculation of beam, cable, area and solid models
- determination of eigenvalues and eigenvectors
- distributed dead loads, point masses and masses from loads
- periodic and free load-time curves
- simultaneous variable exciters at any node
- free node accelerations
- Lehr's damping, mass and stiffness-proportional damping,
Rayleigh's system damping and single viscous dampers
- modal analyses and direct integration of motion equations
- time-step integration for all system reactions with
selectable iteration steps
- stationary response
- evaluation of response spectra according to EC8, DIN 4149,
OENORM B 4015 and SIA 261
- user-defined response spectra
- calculation and output of effective modal masses
- dynamic train crossing on any track
- animation of all time-step calculations
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